iwlegacy: check correct il_poll_bit error value

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlegacy/common.c b/drivers/net/wireless/iwlegacy/common.c
index f343f27..d0d408e 100644
--- a/drivers/net/wireless/iwlegacy/common.c
+++ b/drivers/net/wireless/iwlegacy/common.c
@@ -4136,7 +4136,7 @@
 	ret =
 	    _il_poll_bit(il, CSR_RESET, CSR_RESET_REG_FLAG_MASTER_DISABLED,
 			 CSR_RESET_REG_FLAG_MASTER_DISABLED, 100);
-	if (ret)
+	if (ret < 0)
 		IL_WARN("Master Disable Timed Out, 100 usec\n");
 
 	D_INFO("stop master\n");